need help to install codes in infinity style

[Qatar]

Your Portal Version: 1.0.0RC3
Your phpBB Type: Standard phpBB3
MODs installed: No
Your knowledge: Beginner

What have you done before the problem was there?


What have you already tryed to solve the problem?


Description and Message
hello

i need help to install the portal to infinity style, i alrady install it on prosilver style and it's work great ..

the files need to edit :
template/overall_header.html
template/overall_footer.html
theme/stylesheet.css

to download this 3 files :
http://www.qatar-marine.com/New%20Folder%20(2).rar


thanks a lot